Gnuplot-Pywal is a set of helper scripts that dynamically theme gnuplot based on colors set by pywal.
To install, simply move into the clone directory and run sudo ./install.sh
gplot filename
Instead of running gnuplot, you can now run gplot, or whatever you want to alias it to. Every time it is run, it will execute the gengnuplotconfig script, which will populate your configuration file based on your current colorscheme.
By default, this script overwrites your current config. If you had anything special in that config, add it to the script so it is always in you config.